Sleeve insert



FIG. 1 is a perspective view of an ornamental design for a sleeve insert in the environment of single sided fastening system, according to the present disclosure.

FIG. 2 is cross-sectional perspective view of the sleeve insert of FIG. 1 taken along line 2-2 in FIG. 1.

FIG. 3 is a top plan view of the sleeve insert of FIG. 1.

FIG. 4 is a bottom plan view of the sleeve insert of FIG. 1.

FIG. 5 is a front elevational view of the sleeve insert of FIG. 1.

FIG. 6 is a rear elevational view of the sleeve insert of FIG. 1.

FIG. 7 is a first side elevational view of the sleeve insert of FIG. 1; and,

FIG. 8 is a second side elevational view of the sleeve insert of FIG. 1.

The solid lines in FIGS. 1-8 illustrate a sleeve insert according to the present disclosure. The dash-dash broken lines illustrate environmental structure and form no part of the claimed design. The dash-dot sectional broken line in FIG. 1 forms no part of the claimed design. 

CLAIM The ornamental design for a sleeve insert, as shown and described. 